Proven solutions for reaching low P consents · Densadeg Case Study: Meru, France • Design effluent limits (mg/l) : daily average Influent Pretreatment CAS CSO tank Parameter BOD

Provensolutions for reachinglow P consents:High rate settling (Densadeg™)

High rate flotation (Greendaf™)

Cécile Bourdon

The BIG Phosphorus Conference and Exhibition – Removal & Recovery

4-5 July 2016

GENERAL OVERVIEW OF SOLUTIONS

Application

• Tertiary treatment : TSS, Turbidity and TP removal

Interests

• P removal without changes on the upstream process

• High P removal rate possible (>90%) & possible to remove high amounts of P

• Water quality improvement by removing all particular fraction of the pollution

linked to suspended solids : COD, BOD, Nitrogen

Process in 2-step :

• Phosphorus precipitation : P + Me -> P-Me ; Me = Iron or Aluminium

• Physical separation of clear water and precipitate : Settling, Flotation

On-line control

• Chemical dosing rate controlled by on-line P & Turbidity measurement

General overview of solutions

HIGH RATE SETTLINGDENSADEG

Turbine

Draft Tube

Coagulant

Polymer

Flow

Splitter Sludge

Recycle Pump

Sludge

RecirculationSludge

Blowdown

Settling

Tube

Assembly

Settling

Tube Support

Recirculation Cone

Lifting Assembly

Launder

Assembly

Reactor

Turbine Drive

Rapid

Mix

Reactor

Clarifier / Thickener

High rate settling process – DensadegTM

Main operational features

Coagulant

Turbine

Draft Tube

Polymer

Flow

Splitter Sludge

Recycle Pump

Sludge

RecirculationSludge

Blowdown

Settling

Tube

Assembly

Settling

Tube Support

Recirculation Cone

Lifting Assembly

Launder

Assembly

Reactor

Turbine Drive

Rapid

Mix

Reactor




Turbine

Draft Tube

Coagulant

Polymer

Flow

Splitter Sludge

Recycle Pump

Sludge

RecirculationSludge

Blowdown

Settling

Tube

Assembly

Settling

Tube Support

Recirculation Cone

Lifting Assembly

Launder

Assembly

Reactor

Turbine Drive

Rapid

Mix

Reactor




Turbine

Draft Tube

Coagulant

Polymer

Flow

Splitter Sludge

Recycle Pump

Sludge

RecirculationSludge

Blowdown

Settling

Tube

Assembly

Settling

Tube Support

Recirculation Cone

Lifting Assembly

Launder

Assembly

Reactor

Turbine Drive

Rapid

MixReactor




Sludge is recycled from the clarifier/thickener zone to the reactor zone which

enhances solids contact.


Key benefits and features

Rise Rate up to 25 m/h (on lamella surface)

Solids Recycle Rate: 3% - 6%

Coagulant Dose : depending on the P removal rate

Polymer Dose : 0.3 – 1.0 mg/l

Sludge Solids Concentration: 20 – 25 g/L

Total Phosphorus removal up to 95%, 200 references worldwide, 30 references on tertiary treatment


some worlwide tertiary references

Name CountryCommissioning

year

Flow rate

(m3/h)

Lamella area

(m2)Unit number

Farmers Corner, CO USA 2011 662 - 2

Gainsville, GE USA 2004 3 155 - 2

Colorado Springs, CO USA 2004 1 893 - 2

Etampes France 2002 925 42 1

Bangalore Inde 2002 2 500 67 2

Levenmouth, SC UK 2002 - - 1

Bourg en Bresse France 2000 3 500 50 2

Limoges France 2000 2 300 100 2

Meru France 1999 500, 2 000 25 1

Les Mureaux France 1998 1 600 67 1

Breckenridge, CO USA 1998 315 11 1

Beauvais France 1997 1 420 31 2

Elancourt France 1996 650 31 1

Bonneuil en France France 1996 3 700 100 2

Dreux France 1995 1 850 82 1

Metz France 1995 7 200 140 2

Epinal France 1995 2 200 100 1

Vittel France 1994 610 41 1

Montbeliard France 1993 1 500 67 1

San Rafael USA 1989 318 15 1

• In service since 1998, 1 DensaDeg® treats a peak flow of 315 m3/h

Secondary

clarifier

BAF Densadeg Sand Filter

BOD5 25 / --- 5 /

0.0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

4.5

5.0

5.5

6.0

6.5

7.0

7.5

8.0

30/12/2002 18/02/2003 09/04/2003 29/05/2003 18/07/2003 06/09/2003 26/10/2003 15/12/2003

TP concentration (mg/l) Secondary effluent Densadeg effluent

Alum Dose: 80 mg/L

Polymer: 0.5 mg/L

Rise Rate: 25 m/h

24h composite values

Yearly average = 0.03 mg/l

Yearly 95%ile = 0.12 mg/l

Monthly average ≤ 0.1 mg/l

Densadeg case study:Breckenridge, CO, USA

Densadeg Case Study:Meru, France

• Design effluent limits (mg/l) : daily average

Influent

Pretreatment CAS

CSO tank

Parameter BOD5 COD TSS TKN TP

Guarantee 15 50 20 10 1

• In service since 1999, 1 DensaDeg® treats a peak flow of 500 m3/h (DW),

2 000 m3/h (WW)

Densadeg

0

200

400

600

800

1000

1200

1400

1600

0.0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

4.5

5.0

5.5

6.0

6.5

13:12 13:40 14:09 14:38 15:07 15:36

Flow

rat

e (m

3/h)

Conc

entr

atio

n (m

g/l)

Inlet TP (mg/l) Outlet TP (mg/l) Flow rate (m/h)Inlet TP (mg/l) Outlet TP (mg/l) Flow rate (m3/h)

Flo

w r

ate

(m

3/h

)

Co

nc

en

tra

tio

n (

mg

/l)


Tertiary CSO Transition CSO - Tertiary

Tertiary P removal > 90%

Outlet TP < 0.5 mg/l

Outlet TP ≤ 1.0 mg/l

even during rain event

FeCl3 Dose: 70 mg/L

Polymer: 1.0 (DW) – 2.0 (WW) mg/L


0

200

400

600

800

1000

1200

1400

1600

0

50

100

150

200

250

300

350

400

450

500

550

600

13:12 13:40 14:09 14:38 15:07 15:36

Flo

w r

ate

(m

3/h

)

Co

nce

ntr

atio

n (

mg

/l)

Inlet TSS (mg/l) Outlet TSS (mg/l) Flow rate (m/h)

Tertiary CSO Transition CSO - Tertiary

Tertairy TSS removal > 70%

Outlet TSS ≤ 20 mg/l

TSS removal during rain

event > 85% up to 95%

FeCl3 Dose: 70 mg/L

Polymer: 1.0 (DW) – 2.0 (WW) mg/L

HIGH RATE FLOTATIONGREENDAF TM

1. coagulationferric chloride or alum

2. hydraulic floculationused to create micro flocs. flocculation time = 5 to 7 min

3. saturation8 to 10% of recirculationpressurization and pressure relief system

4. flotationformation of bubble blanketin flotation zone

5. false floorpatented technologyvelocity of 20 to 30 m/hour

6. hydraulic or biological sludgeevacuation

High rate flotation process – GreendafTM



Key benefits and features

Rise Rate up to 30 m/h (on flotation area)

No need to inject matter for floc ballasting

Easy maintenance (few mechanical components, no lamellar modules)

Polymers only used occasionally (in the event of suspended solids peaks)

Recirculation pressurized water : 8% - 10%

Coagulant Dose : depending on the P removal rate

Sludge Solids Concentration: 15 g/L

Total Phosphorus removal up to 90%,


Worldwide tertiary references

Name CountryCommissi

oning year

Flow rate

(m3/h)

Flotation

area (m2)

Unit

number

Kaifeng China 2015 5 400 57 4

Roux

CanalBelgium 2012 675 24 1

Evreux France 2011 1 770 24 3

Hudson USA 2009 1 050 22 2

Greendaf Case Study :Hudson, MA, USA

Context

• Client: Hudson Town, Massachusetts

• Problems: complying with the requirements of the very low consent of P < 0.2 mg/L

• Capacity : 25 000 m3/d

• Treatment line : Primary sedimentation, CAS

• Solution to achieve the P guarantee : Greendaf TW + Sand filter

Pilot-plant trials to show the effectiveness of Greendaf TW


0.01

0.1

1

10

100

3/5/06 4:48 3/5/06 14:24 4/5/06 0:00 4/5/06 9:36 4/5/06 19:12 5/5/06 4:48 5/5/06 14:24 6/5/06 0:00

FeCl3 dosing (mg/l) In Turb (NTU) Out Turb (NTU) In PO4-P (mg/l) Out PO4-P (mg/l)

No Polymer dosing

Rise Rate: 20 m/h

Outlet PO4-P ≤ 0.1 mg/l P precipitation > 87%

Turbidity removal average = 90%


FeCl3 dosing : 40-45 mg/l

No Polymer dosing

Rise Rate: 30 m/h

0.01

0.10

1.00

10.00

100.00

17/5/06 0:00 18/5/06 4:48 19/5/06 9:36 20/5/06 14:24 21/5/06 19:12 23/5/06 0:00 24/5/06 4:48 25/5/06 9:36

In Turb (NTU) Out Turb (NTU) In PO4-P (mg/l) Out PO4-P (mg/l) Turb RE (%) PO4-P RE (%)

PO4-P & Turbidity removal > 90%

Conclusions

• How to choose between Densadeg and Greendaf?

Parameters Densadeg Greendaf TW

compactness + ++

Sludge concentration

(g/l)20-25 15

Polymer dosing Required (0.3-1.0) Only for TSS peaks

Proven processes to achieve TP ≤ 0.1-1.0 mg/l

Suez Contact in UK

OIS - SUEZ Advanced Solutions UK

Sean Ashton

(UK business development manager)

[email protected]

Documents

Proven solutions for reaching low P consents · Densadeg Case Study: Meru, France • Design effluent limits (mg/l) : daily average Influent Pretreatment CAS CSO tank Parameter BOD